Vat dye.



i of partsof l-an'throl in 600 parts of dry chlorobenzene; stirring is continued for UNITED srarnsyf runr OFFICE.

WILHELM BAUER, OF VOHWINKEL, AND ALFRED HERRE AND BUDOLF MAYER, 0Y1 ELBERFIJLD, GERMANY, ASSIGNORS TO FARBENFABRIKEN VORM. FRIEDR. BAYER 8b (30., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

Patented Mar. '7, 1911.

VAT DYE.

985, 767. Specification of Letters Patent.

No Drawing.

Application filed June 18, 1910; Serial No. 567,688.

To all whom it may concern:

Be it known that we, VViLnELM. Burns, residing; at Vohwinkel, and ALFRED Herein and RUDoLr MAYER. residing at Elberfeld Germany, citizens of the German Empire, have invented useful Improvements in New Vat Dye, of which the following is a specification. T

Our invention relates to the manufacture and production of. new and valuable vat dyestufis. They are obtained by condensing monohalog'cnated beta-naphthisatin derivatives in which the oxygen of the alpha-keto group is replaced by easily movable or replaceable substituents, e. g. halogen, sulfur, the amino group, -the alkoxy group with phenolic compounds, especially 'l-anthrol l-naphthol, 1.5- and 1.S--dioxyanthracencs and their substituted derivatives having a free ortho position to the hydroxy group.

The new dyes are in a dry state dark blue crystz'l-lline powders with a net-allic luster which. are soluble in hot nitrobenzene generally with a, blue coloration, and which yield with hydrosullite and caustic soda lye generally orange vat-s dyeing cotton after exposure to air blue-gray to black shades .re-

' markable for their fastness to chlorin In (ii'ilel'lO illustrate the new proces more fully we caiiproceed as follows, the parts being by weight: 69. parts of bromobetanaphthisatin are converted into the alpha chlorid. by heating them with parts of PCl and 500 parts of dry chlorobenzene. The mixture thus obtained is then added to a warm'solut-ion, which is well-stirred,

some time while it is hot. After cooling the dye'i's filtered off and washed with benzone and ether. It is a dark blue powder difficultly soluble in cold concentrated sul which cotton is dyed after exposure to air in fast gray to black shades. Chloro-betanaphthisatin furnishes a similar product.

\Ve claim:

1. The herein described new dye'stuiis obtainable from a mono-halogenated betanaphthisat-in derivative in which the oxygen of the alpha-keto group is replaced by easily movable or replaceable substitnentsand a phenolic compound, which dyestuffs'arein a dry state dark blue crystalline powders with a metallic luster which are soluble in hot nitrol'ienzene generally with a blue colors tion. and which yield with hydrosulfite and caustic soda lye vats dyeing cotton after exposure to air from gray to black shades remarkable for their fastness to chlorin, substantially as described.

2. The herein described new dyestuffs obtainable from bromo-beta-naphthisatinalpha-chlorid and l-anthrol. which dyestuft is in a dry-statedark blue powder. soluble in concentratedsulfuric acid with an olivelJ JWIl color, and which yields with hydrowhite and caustic soda lye an orange vat from which cotton is dyed a gray to bla k remarkable for its fastness to chlorin. substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

Witnesses:

O'rro Koivie, CHAS. J. WRIGHT. 

